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Assuming you have an Eaton-Fuller twin countershaft transmission, you need to get under the truck and remove the access plate (if it's still there). I don't remember offhand the socket size for that, but I do believe it's ASE (with the fleet for the company I work for, most trucks don't have the access plate).

The adjustment bolt.. you'll see it.. it's the only five sided bolt on the pressure plate, and it'll be between two round rivets. If you don't see it right away, you'll have to bump the starter (or have a buddy do it for you while you observe to see when it's positioned right). Once it's in position, then you have to depress the clutch.. if you have someone to do it, they can depress it... I usually use Blue Point hood prop rod for this (Harbor Freight, O'Reilly Auto Parts, Auto Zone, Advanced Auto Parts, Pep Boys.. they all sell something similar.. it's just a telescoping rod which you can lock into position).. adjusting the clutch, you need a 5/8" socket.. you can use a 3/8" or 1/2" drive ratchet for this... doesn't really matter, so long as you can reach.. I usually use my 1/2" drive, because it has a longer handle, and my 3/8" sockets have the button on the back to release the socket, and they get in the way... you get the ratchet onto that bolt, then you take a prybar and push on the back of the socket.. once the bolt pushes inward, you can adjust the clutch.. clockwise (marked as "on" with some ratchet brands) increases your pedal free play.. counterclockwise (marked as "off" on some ratchet brands) decreases pedal free play. At the end of it, you should have at least 1-1/2" of free play in the clutch pedal, and a 1/2" gap behind the throwout bearing.. if you have the 1/2" gap behind the throwout bearing and you either have less than 1-1/2" or more than 2-1/2" of free play in the clutch, then you'll need to adjust the linkage.

This is universal for all Eaton-Fuller twin-countershaft transmissions, whether it's a synch box or an unsynchronized transmission. And the same holds true whether it's a linkage clutch or whether it has a hydraulic clutch (e.g., Volvos, the Kenworth T680, etc.). In the case of the hydraulic clutches, the pedal free play is self-adjusting, although you'll still have to ensure that you have the 1/2" gap behind the throwout bearing (which, by the way, you can measure with a 1/2" socket extension... no need to buy the measuring forks).

Rockwell transmissions should be more the same, although the socket sizes might vary with those.

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2014-04-29 05:18:53
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Q: How do you adjust the clutch on a Class 7 or 8 truck?
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Yes. A Class 7 single axle straight truck exceeds the 26000 lb. GVWR. A semi truck is a Class 8 truck.

What are the identifying differences of class 6 and 7 and 8 trucks?

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Is a light duty commercial truck a semi truck?

"Semi truck" has become common usage for a Class 7 or 8 truck driver pulling a trailer which is mounted by a fifth wheel, but can be applied to any truck pulling a trailer which is fifth wheel mounted.

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What are the 5 major truck manufacturers of class 5 6 7 and 8 trucks explain the different classes?

In North America, the primary manufacturer's of Class 8 trucks are Daimler A.G. (parent company of Freightliner and Western Star), Volvo A.B. (parent company of Volvo Trucks and Mack), Navistar (International), and PACCAR, Inc. (parent company of Peterbilt and Kenworth). Additionally, those manufacturers offer trucks in classes 5, 6, and 7, as well. Other class 5, 6, and 7 manufacturers and marketers include Ford, General Motors/Isuzu (via Chevrolet, GMC, and Isuzu... often badge engineering the other's products), Dodge (the Ram 5500 is a Class 5 truck, and was also sold as the Sterling Bullet until 2009), UD-Nissan Diesel, Hino... in the past, all the major auto manufacturers had a heavy truck division.. Dodge bowed out in the late 1970s, and, having been purchased by Daimler A.G., it made it pointless for them to try reestablishing it... Daimler is also the parent company of Freightliner, Western Star (from 1997 onwards) and Sterling (from 1997 to 2009.. Sterling was what used to be Ford's heavy truck division)... General Motors got out of it in the late 1980s, and put more effort into a joint venture with Volvo A.B. (Volvo trucks rebadged under the White-GMC name).. Ford sold their heavy truck division in 1997. The difference is weight rating. A Class 8 truck is a truck with a weight rating in excess of 33,000 lbs. GVWR. A Class 7 truck has a GVWR from 26,001 to 33,000 lbs.... Class 7 and 8 are heavy duty trucks, and require a CDL in the US if not operated under specific exemptions (military vehicles, emergency vehicles, farm vehicles, recreational vehicles... all under certain conditions). A Class 6 truck has a GVWR from from 19,510 to 26,000 lbs. A Class 5 truck has a GVWR from 16,001 to 19,000 lbs. Classes 4, 5, and 6 are medium duty.. anything with a GVWR of 16,000 lbs. or less is light duty.

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You don't adjust the clutch brake itself - that gets replaced. If you're trying to adjust the clutch itself, see the related question "how do you adjust a clutch on a Class 7 or 8 truck"... I've spelled it out there already

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